Shop by Brand: Ronstan

• Integrated stainless steel hub to accept lashing attachment and through-sheave becket
  
• Suits up to 4mm(5/32") lashing
  
• Includes 750mm (30") x 1.7mm(1/16") diam lashing

• Control lines on dinghies and catamarans to 5M(16')

• Sheave: High compression strength carbon acetal
  
• Ball bearings: stainless steel
  
• Frame/Cheeks: Nylon

Series 20 BB Block Single Becket Option Lashing High Load

Features:

• Suits up to 4mm (5/32”) lashing
• Supplied with 750mm (30”) x 2mm (3/32”) diameter,
• Dyneema® single braid lashing line

Series 25 Utility Block - Single Swivel Ring Head

Features:

• Lightweight durable construction
• Economical
• Maintenance free

Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase.

Applications:

• Vang, cunningham and trapeze retriever systems on dinghies
• Leech line tackles, bunk adjusters etc on larger yachts

Materials:

• UV stabilized Acetal sheaves
• Grade 316 stainless steel cheeks

Series 25 Utility Block - Single, Becket, Loop Head

Features:

• Lightweight durable construction
• Economical
• Maintenance free

Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase.

Applications:

• Vang, cunningham and trapeze retriever systems on dinghies
• Leech line tackles, bunk adjusters etc on larger yachts

Materials:

• UV stabilized Acetal sheaves
• Grade 316 stainless steel cheeks

Series 30 Ball Bearing Block Single Becket Option Lashing

Ball Bearing Blocks™ boast the highest strength-to-weight ratio available.  This is achieved through all-composite reinforced polymer materials and multiple attachment options. Their precision design provides the optimum number of ball bearings for minimum friction while weight reduction is achieved through the use of fibre-reinforced composites in the block head, cleat arms and beckets. 

Highest Working Load in its Class

The proven Ronstan 2-stage bearing system (Series 30 and larger) features high compression grade Acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range.

The sheave and bearing system is supported by a fibre-reinforced load frame, computer modelled and optimised using advanced stress analysis methods. The Dyneema® Link, used in multi-sheave blocks, is produced from high spec SK75 fibre, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point.

Simple, Versatile & Secure Attachment

The single block is easily lashed to an attachment point, and can also accept Dyneema® Links and shackles for a variety of efficient attachment alternatives. The Dyneema® Link used in multi-sheave blocks is easily fitted and secured by a removable pin. The Dyneema® Link can also be removed and replaced by a shackle, custom lashing or strop.

These blocks are far more compatible with Dyneema®/Spectra® lines, carbon laminate connection points and webbing than traditional blocks with steel loop tops or shackles.

Low Profile & Compact

The two way head in the single lashing block allows for alignment at 0° or 90° orientation, while the single swivel block allows for full articulation.

The flexible Dyneema® Link used in multi-sheave blocks provides 0° or 90° orientation. It connects directly to the head of the block rather than to an intermediate head post. This reduces weight and gives the lowest possible profile while allowing full articulation. Beckets have been carefully designed to minimise height.

Features:

• Lightweight
• Highest working load in its class
• Secure, versatile and secure attachement
• Low profile and compact
• Ultra low profile thru-sheave becket
• Self-lubricating Nylatron® sheave and full contact bearing for high dynamic loads

Applications:

• Mainsheet systems and spinnaker sheets on dinghies to 5M(16')
• Halyard, vang and backstay applications on boats to 5M(16')
• Control line applications on larger yachts

• Lightweight
  
• Highest working load in its class
  
• Secure, versatile and secure attachement
  
• Low profile and compact

• Mainsheet systems and spinnaker sheets on dinghies to 5M(16')
  
• Halyard, vang and backstay applications on boats to 5M(16')
  
• Control line applications on larger yachts

• Sheave: High compression strength carbon black Acetal
  
• Ball Bearings: High compression strength Acetal
  
• Frame/Cheeks: Toughened, glass fiber reinforced Nylon
  
• Link: UV stabilized, multi-strand impregnated SK75 Dyneema®

• Lightweight
  
• Highest working load in its class
  
• Secure, versatile and secure attachement
  
• Low profile and compact

• Mainsheet systems and spinnaker sheets on dinghies to 5M(16')
  
• Halyard, vang and backstay applications on boats to 5M(16')
  
• Control line applications on larger yachts

• Sheave: High compression strength carbon black Acetal
  
• Ball Bearings: High compression strength Acetal
  
• Frame/Cheeks: Toughened, glass fiber reinforced Nylon
  
• Link: UV stabilized, multi-strand impregnated SK75 Dyneema®

• Lightweight
  
• Highest working load in its class
  
• Secure, versatile and secure attachement
  
• Low profile and compact
  
• Ultra low profile thru-sheave becket
  
• RF35101 accepts RF1850S shackle in both orientations to create a conventional loop top block
  
• Self-lubricating Nylatron® sheave and full contact bearing for high dynamic loads

• Mainsheet systems and spinnaker sheets on dinghies to 5M(16')
  
• Halyard, vang and backstay applications on boats to 5M(16')
  
• Control line applications on larger yachts

• Sheave: High compression strength carbon black Acetal
  
• Ball Bearings: High compression strength Acetal
  
• Frame/Cheeks: Toughened, glass fiber reinforced Nylon
  
• Link: UV stabilized, multi-strand impregnated SK75 Dyneema®

• Lightweight
  
• Highest working load in its class
  
• Secure, versatile and secure attachement
  
• Low profile and compact
  
• Ultra low profile thru-sheave becket
  
• Low friction 2-stage ball bearing system provides consistent performance over the full working load range

• Mainsheet systems and spinnaker sheets on dinghies to 5M(16')
  
• Halyard, vang and backstay applications on boats to 5M(16')
  
• Control line applications on larger yachts

• Sheave: High compression strength carbon black Acetal
  
• Ball Bearings: High compression strength Acetal
  
• Frame/Cheeks: Toughened, glass fiber reinforced Nylon
  
• Link: UV stabilized, multi-strand impregnated SK75 Dyneema®

Series 30 Utility Ball Bearing Block - Single, Becket, Swivel Shackle Head

Features:

• Low friction 2-stage ball bearing system provides consistent performance over the full working load range.
• High static and dynamic load capacity.
• Light weight
• Versatile head fittings
• Cheek cut-outs for easy bearing maintenance

Product Information:

Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.

Applications:

• Primary lead blocks on dinghies and catamarans
• Control lines on larger yachts

Materials:

• U.V. stabilized Acetal sheaves
• Acetal ball bearings
• Impact modified, fiber reinforced and U.V. stabilized Nylon cheeks
• Grade 316 stainless steel load straps and head fittings

Series 30 Utility Ball Bearing Block - Single, Swivel Shackle Head

Features:

• Low friction 2-stage ball bearing system provides consistent performance over the full working load range.
• High static and dynamic load capacity.
• Light weight
• Versatile head fittings

Product Information:

Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Can be fitted with a shackle in either of two planes to allow correct alignment of the block.

Applications:

• Primary lead blocks on dinghies and catamarans
• Control lines on larger yachts

Materials:

• U.V. stabilized Acetal sheaves
• Acetal ball bearings
• Impact modified, fiber reinforced and U.V. stabilized Nylon cheeks
• Grade 316 stainless steel load straps and head fittings

Series 30 Utility Ball Bearing Block - Stand-up, Loop Top

Features:

• Low friction 2-stage ball bearing system provides consistent performance over the full working load range.
• High static and dynamic load capacity.
• Light weight
• Versatile head fittings

Priduct Information:

Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.

Applications:

• Primary lead blocks on dinghies and catamarans
• Control lines on larger yachts

Materials:

• U.V. stabilized Acetal sheaves
• Acetal ball bearings
• Impact modified, fiber reinforced and U.V. stabilized Nylon cheeks
• Grade 316 stainless steel load straps and head fittings

Series 30 Utility Block- Double, Loop Top

Features:

• Lightweight durable construction
• Economical
• Maintenance free

Product Information:

Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance.

Applications:

• Vang, cunningham and trapeze retriever systems on dinghies
• Leech line tackles, bunk adjusters etc on larger yachts

Materials:

• U.V. stabilized Acetal sheaves
• Grade 316 stainless steel cheeks

Series 30 Utility Block- Double, Tube Rivet

Features:

• Lightweight durable construction
• Economical
• Maintenance free

Product Information:

Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance.Hollow rivets accept fixing screws, shackles or can be used as a becket for extra purchase.

Applications:

• Vang, cunningham and trapeze retriever systems on dinghies
• Leech line tackles, bunk adjusters etc on larger yachts

Materials:

• U.V. stabilized Acetal sheaves
• Grade 316 stainless steel cheeks

Series 30 Utility Block - Single, Becket, Ferrule Eye Head

Features:

• Lightweight durable construction
• Economical
• Maintenance free

Product Information:

Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase.

Applications:

• Vang, cunningham and trapeze retriever systems on dinghies
• Leech line tackles, bunk adjusters etc on larger yachts

Materials:

• U.V. stabilized Acetal sheaves
• Grade 316 stainless steel cheeks

Series 30 Utility Block - Single, Becket, Loop Head

Features:

• Lightweight durable construction
• Economical
• Maintenance free

Product Information:

Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase.

Applications:

• Vang, cunningham and trapeze retriever systems on dinghies
• Leech line tackles, bunk adjusters etc on larger yachts

Materials:

• U.V. stabilized Acetal sheaves
• Grade 316 stainless steel cheeks

Series 30 Utility Block - Single, Swivel Shackle Head

Features:

• Lightweight durable construction
• Economical
• Maintenance free

Product Information:

Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase.

Applications:

• Vang, cunningham and trapeze retriever systems on dinghies
• Leech line tackles, bunk adjusters etc on larger yachts

Materials:

• U.V. stabilized Acetal sheaves
• Grade 316 stainless steel cheeks

• Black Chromed Grade 316 stainless steel car bodies
  
• Grade 316 stainless steel wheels and fixtures

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing. Head swivels freely.

Features:

• Exceptionally high working loads
• Low maintenance, long service life
• Self-lubricating sheave
• Slotted pin shackle eliminates fouled lines
• Two way head post

Applications:

• Mainsheet
• Halyard
• Vang
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8M(26')

Materials:

• U.V. stabilized Acetal sheaves
• Impact and U.V. resistant, fiber reinforced Nylon cheeks
• Grade 316 stainless steel bearing race
• Grade 316 stainless steel load strap and head fitting

Specifications:

• Sheave Ø: 40mm(1-9/16")
• Max. Rope Ø: 10mm(7/16")
• Pin Ø: 5mm(3/16")
• M.W.L.: 600kg(1,320lbs)
• B. L.: 1,200kg(2,650lbs)
• Weight: 135g(4.8oz)

Series 40 All Purpose Block - Fiddle - Becket

Features:

• Exceptionally high working loads
• Low maintenance, long service life
• Self-lubricating sheave
• Captive Lock™ universal head
• Slotted pin shackle eliminates fouled lines
• Snap fit removable becket pin
• Spare parts - RF41010 Replacement Becket Pin, RF150 Shackle

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required. Becket pin is removable so line can be spliced prior to fitting and is ingeniously locked into position without the use of a clevis pin, split ring or tools.

Applications:

• Mainsheet
• Halyard
• Vang
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)
• Ideal for fine-tune mainsheet tackles, cunninghams, backstays and other control line purchase systems.

Materials:

• U.V. stabilised Acetal sheaves
• Impact and U.V. resistant, fibre reinforced Nylon cheeks
• Grade 316 stainless steel bearing race
• Grade 316 stainless steel load strap and head fitting
• Impact and UV resistant, fiber reinforced Nylon cheeks

Series 40 All Purpose Block - Fiddle - Cleat

Features:

• Exceptionally high working loads
• Low maintenance, long service life
• Self-lubricating sheave
• Captive Lock™ universal head
• Slotted pin shackle eliminates fouled lines
• Multi-position cleat arm

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required. Quick adjusting cleat arms require no tools to adjust and fix securely in position.

Applications:

• Mainsheet
• Halyard
• Vang
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)
• Ideal for fine-tune mainsheet tackles, cunninghams, backstays and other control line purchase systems.

Materials:

• U.V. stabilised Acetal sheaves
• Impact and U.V. resistant, fibre reinforced Nylon cheeks
• Grade 316 stainless steel bearing race
• Grade 316 stainless steel load strap and head fitting
• Impact and UV resistant, fiber reinforced Nylon cheeks

• Exceptionally high working loads
  
• Low maintenance, long service life
  
• Self-lubricating sheave
  
• Captive Lock™ universal head
  
• Mount with 2 x 5mm (3/16") fasteners (not supplied)

• Mainsheet
  
• Halyard
  
• Vang
  
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8M(26')

• U.V. stabilized Acetal sheaves
  
• Impact and U.V. resistant, fiber reinforced Nylon cheeks
  
• Grade 316 stainless steel bearing race
  
• Grade 316 stainless steel load strap and head fitting

• Exceptionally high working loads
  
• Low maintenance, long service life
  
• Self-lubricating sheave
  
• Captive Lock™ universal head
  
• Slotted pin shackle eliminates fouled lines

• Mainsheet
  
• Halyard
  
• Vang
  
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8M(26')

• U.V. stabilized Acetal sheaves
  
• Impact and U.V. resistant, fiber reinforced Nylon cheeks
  
• Grade 316 stainless steel bearing race
  
• Grade 316 stainless steel load strap and head fitting

Series 40 All Purpose Block - Single Upright Lead

Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Ideal for high load applications. Wear resistant sheave material, in lightweight, self lubricating polymer, is suitable for use with rope or wire.

Applications:

• Typically used for halyards at the mast base.

Materials:

• UV stabilised acetal sheave
• Grade 316 stainless steel load housing

Series 40 All Purpose Block - Triple - Swivel Head

Features:

• Exceptionally high working loads
• Low maintenance, long service life
• Self-lubricating sheave
• Slotted pin shackle eliminates fouled lines
• Two way head post
• Spare parts - RF41010 Replacement Becket Pin, RF150 Shackle

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.

Applications:

• Mainsheet
• Halyard
• Vang
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)

Materials:

• U.V. stabilised Acetal sheaves
• Impact and U.V. resistant, fibre reinforced Nylon cheeks
• Grade 316 stainless steel bearing race
• Grade 316 stainless steel load strap and head fitting
• Sheave: UV stabilised acetal
• Cheeks: Impact modified, fiber reinforced and UV stabilized nylon

Series 40 Ball Bearing Block - Fiddle

Features:

• Low friction Acetal or Torlon® bearing system
• Lightweight
• Cheek cut-outs for easy bearing maintenance
• Captive Lock™ universal head
• Slotted pin shackle eliminates fouled lines
• Low friction, 2-stage ball bearing system
• High static and dynamic load capacity
• Lightweight
• Cheek cut-outs for easy bearing maintenance

Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required

Applications:

• Mainsheet
• Halyard
• Vang
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)
• Typically used in direct 4:1 purchase systems such as mainsheets and boom vangs
• On larger boats they are used for fine-tune mainsheet tackles, outhauls, cunninghams, checkstays, genoa lead pullers and traveller controls.

Materials:

• Acetal ball bearings
• UV stabilized Acetal sheave
• Grade 316 stainless steel load strap and head fitting
• Impact and UV resistant, fiber reinforced Nylon cheeks

Series 40 Ball Bearing Block - Fiddle - Becket

Features:

• Low friction Acetal or Torlon® bearing system
• Lightweight
• Cheek cut-outs for easy bearing maintenance
• Captive Lock™ universal head
• Slotted pin shackle eliminates fouled lines
• Snap fit removable becket pin

Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required. Becket pin is removable so line can be spliced prior to fitting and is ingeniously locked into position without the use of a clevis pin, split ring or tools

Applications:

• Mainsheet
• Halyard
• Vang
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)
• Typically used in direct 4:1 purchase systems such as mainsheets and boom vangs
• On larger boats they are used for fine-tune mainsheet tackles, outhauls, cunninghams, checkstays, genoa lead pullers and traveller controls.

Materials:

• Acetal ball bearings
• UV stabilized Acetal sheave
• Grade 316 stainless steel load strap and head fitting
• Impact and UV resistant, fiber reinforced Nylon cheeks

Series 40 Ball Bearing Block - Fiddle - Becket - Cleat

Features:

• Low friction Acetal or Torlon® bearing system
• Lightweight
• Cheek cut-outs for easy bearing maintenance
• Captive Lock™ universal head
• Slotted pin shackle eliminates fouled lines
• Snap fit removable becket pin
• Multi-position cleat arm
• Low friction, 2-stage ball bearing system
• High static and dynamic load capacity
• Lightweight
• Cheek cut-outs for easy bearing maintenance

Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required. Quick adjusting cleat arms require no tools to adjust and fix securely in position. Becket pin is removable so line can be spliced prior to fitting and is i

Applications:

• Mainsheet
• Halyard
• Vang
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats  up to 8m (26ft)
• Typically used in direct 4:1 purchase systems such as mainsheets and boom vangs
• On larger boats they are used for fine-tune mainsheet tackles, outhauls, cunninghams, checkstays, genoa lead pullers and traveller controls.

Materials:

• Acetal ball bearings
• UV stabilized Acetal sheave
• Grade 316 stainless steel load strap and head fitting
• Impact and UV resistant, fiber reinforced Nylon cheeks

• Low friction Acetal or Torlon® bearing system
  
• Lightweight
  
• Cheek cut-outs for easy bearing maintenance
  
• Captive Lock™ universal head
  
• Slotted pin shackle eliminates fouled lines

• Mainsheet
  
• Halyard
  
• Vang
  
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8M(26')

• U.V. Stabilized Acetal sheaves
  
• Acetal ball bearings
  
• Impact and U.V. resistant, fiber reinforced Nylon cheeks
  
• Grade 316 stainless steel load strap and head fitting

Series 40 Ball Bearing Block - Single Loop Top - Becket

Features:

• Low friction Acetal or Torlon® bearing system
• Lightweight
• Cheek cut-outs for easy bearing maintenance
• Snap fit removable becket pin

Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Becket pin is removable so line can be spliced prior to fitting and is ingeniously locked into position without the use of a clevis pin, split ring or tools.

Applications:

• Mainsheet
• Halyard
• Vang
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)

Materials:

• Acetal ball bearings
• UV stabilized Acetal sheave
• Grade 316 stainless steel load strap and head fitting
• Impact and UV resistant, fiber reinforced Nylon cheeks

Series 40 Ball Bearing Block - Single Upright Lead

Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Precision molded Acetal sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.

Applications:

• Typically used for halyards at the mast base.

Materials:

• Acetal ball bearings
• UV stabilized Acetal sheave
• Grade 316 stainless steel load housing